Hand of Death

Death has no claim on you. In exchange for staying its cold hand without that hand closing, you become a maw through which death feeds on the world around you.

Adamant Endurance.

You have Advantage on Constitution saving throws.

Cling to Life.

When you have 0 Hit Points at the start of your turn, or when you die, you can instead choose to regain a number of Hit Points equal to half your maximum. Once you use this feature, you can’t use it again. After using it, whenever you regain Hit Points through any means, you gain only half that amount.

Once a Humanoid (other than you) dies within 30 feet of you, you regain the use of this feature, and you can regain Hit Points as normal.

Death Knell.

Other creatures within 10 feet of you have Disadvantage on Death Saving Throws, and you can’t restore Hit Points to a creature with 0 Hit Points by any means.